Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1981-02-25
1982-09-28
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
324 52, 361 84, H02H 318
Patent
active
043521371
ABSTRACT:
This invention relates to methods and apparatus for detecting the occurrence of a fault on a conductor or transmission line and for protecting the conductor or line in accordance with the determination of fault. The instantaneous value of the voltage (V) and current (i), or the modal components of that voltage and current in the case of a polyphase line, are formed into two functions S.sub.1R and S.sub.2R, which are of the general form V-iR and V+iR respectively where R is a replica of the surge impedance of the line. Superimposed components of these functions are derived by continuously subtracting the steady-state value of each function from its instantaneous value. The sequence in which the functions obtain a value outside a predetermined band of values is monitored to provide an indication of the existence and direction of a fault with respect to the measuring point. Trip and block signals are generated for operating circuit breakers.
REFERENCES:
patent: 3524075 (1970-08-01), Matthews et al.
patent: 3931502 (1976-01-01), Kohlas
patent: 3983456 (1976-09-01), Suzuki
patent: 4128805 (1978-12-01), Lanz
patent: 4234901 (1980-11-01), Strickland, Jr.
patent: 4251766 (1981-02-01), Souillard
Eisenzopf Reinhard J.
The General Electric Company Limited
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